#include <bits/stdc++.h>
#define int long long
using namespace std;
string to_string(string s) { return s; }
template <typename T> string to_string(T v) {
bool first = true;
string res = "[";
for (const auto &x : v) {
if (!first)
res += ", ";
first = false;
res += to_string(x);
}
res += "]";
return res;
}
template <typename A, typename B>
string to_string(pair<A, B> p) {
return "(" + to_string(p.first) + ", " + to_string(p.second) + ")";
}
void dbg_out() { cout << endl; }
template <typename Head, typename... Tail> void dbg_out(Head H, Tail... T) {
cout << ' ' << to_string(H);
dbg_out(T...);
}
#ifdef DEBUG
#define dbg(...) cout << "(" << #__VA_ARGS__ << "):", dbg_out(__VA_ARGS__)
#else
#define dbg(...)
#endif
struct State {
int source = -1; int target = -1; int distance = 1e18;
State next (int node, int next, int cost) {
State st;
st.source = source == -1 ? next : source;
st.distance = cost + distance;
if (next == target) st.distance = 1e18;
st.target = node;
return st;
}
bool operator< (const State &other) const {
return distance < other.distance;
}
};
string to_string (State state) {
if (state.distance == 1e18)
return "State#";
return "State[" + to_string(state.source + 1) + " => " + to_string(state.target + 1) + ", " + to_string(state.distance) + "]";
}
int modify (vector<State> &states, State new_state, bool based_on_target) {
for (int i = 0; i < 3; i ++) {
if (states[i].source == new_state.source
&& states[i].distance == new_state.distance
&& states[i].target == new_state.target) {
return -1;
}
}
vector<State> state_array;
for (State a : states) state_array.push_back(a);
state_array.push_back(new_state);
sort(state_array.begin(), state_array.end());
set<int> source_seen;
set<int> target_seen;
states.clear();
for (int i = 0; i < state_array.size(); i ++) {
int src = based_on_target ? state_array[i].target : state_array[i].source;
if (source_seen.find(src) == source_seen.end() && states.size() < 3)
states.push_back(state_array[i]);
if (src != -1 && (!based_on_target || i != 0)) source_seen.insert(src);
}
while (states.size() < 3) states.push_back(State());
for (int i = 0; i < 3; i ++) {
if (states[i].source == new_state.source
&& states[i].distance == new_state.distance
&& states[i].target == new_state.target) {
return i;
}
}
return -1;
}
struct Matrix {
vector<State> pcc = vector<State>(3);
vector<State> pcc_tar = vector<State>(3);
vector<State> all () {
return { pcc[0], pcc[1], pcc[2], pcc_tar[1], pcc_tar[2] };
}
Matrix merge (Matrix &other) {
dbg(other);
vector<State> simple(3);
for (State s1 : all()) {
for (State s2 : other.all()) {
if (s1.target == s2.source) continue ;
State s3 = s1;
s3.target = s2.target;
s3.distance += s2.distance;
dbg(s1, s2, s3);
modify(simple, s3, false);
}
}
int exc_targ = simple[0].target;
vector<State> exclu(3);
for (State s1 : all()) {
for (State s2 : other.all()) {
if (s1.target == s2.source || s2.target == exc_targ) continue ;
State s3 = s1;
s3.target = s2.target;
s3.distance += s2.distance;
modify(exclu, s3, false);
}
}
Matrix res;
res.pcc = simple;
res.pcc_tar = { simple[0], exclu[0], exclu[1] };
dbg(res);
return res;
}
};
string to_string (Matrix matrix) {
return "Mat" + to_string(matrix.all());
}
using vMatrix = vector<Matrix>;
using ti = pair<pair<int, int>, pair<int, bool>>;
using pq = priority_queue<ti, vector<ti>, less<ti>>;
template<typename T>
using grid = vector<vector<T>>;
using idata = vector<int>;
using graph = grid<pair<int, int>>;
int N, M, T, L;
graph roads;
vMatrix dijkstra (int start) {
pq q;
q.push({ { 0, 0 }, { start, false } });
q.push({ { 0, 0 }, { start, true } });
vMatrix matrices(N);
matrices[start].pcc [0].distance = 0;
matrices[start].pcc_tar[0].distance = 0;
dbg(start);
while (q.size() != 0) {
const auto data = q.top(); q.pop();
int srcId = data.first.second;
int curr = data.second.first;
bool isTar = data.second.second;
State state = isTar ? matrices[curr].pcc_tar[srcId] : matrices[curr].pcc[srcId];
if (state.distance != data.first.first) continue ;
for (const auto &road : roads[curr]) {
if (state.target == road.first) continue ;
State next_state = state.next( curr, road.first, road.second );
int res = modify(matrices[road.first].pcc, next_state, false);
if (res != -1)
q.push({ { next_state.distance, res }, { road.first, false } });
res = modify(matrices[road.first].pcc_tar, next_state, true);
if (res != -1)
q.push({ { next_state.distance, res }, { road.first, true } });
}
}
return matrices;
}
grid<Matrix> matrixGrid;
signed main () {
ios_base::sync_with_stdio(false); cin.tie(NULL);
cin >> N >> M >> T >> L;
roads.resize(N);
for (int i = 0; i < M; i ++) {
int a, b, c;
cin >> a >> b >> c;
a --; b --;
roads[a].push_back({ b, c });
roads[b].push_back({ a, c });
}
for (int i = 0; i < N; i ++)
matrixGrid.push_back( dijkstra(i) );
idata DV(L);
for (int i = 0; i < L; i ++) {
cin >> DV[i];
DV[i] --;
}
for (int i = 0; i < T; i ++) {
int p, v;
cin >> p >> v;
p --;
v --;
DV[p] = v;
Matrix result = matrixGrid[DV[0]][DV[1]];
dbg(result);
for (int j = 2; j < L; j ++) {
dbg(DV[j - 1] + 1, DV[j] + 1);
result = result.merge(matrixGrid[DV[j - 1]][DV[j]]);
}
int answer = result.pcc[0].distance;
if (answer == 1e18) answer = -1;
cout << answer << "\n";
}
}
Compilation message
wild_boar.cpp: In function 'long long int modify(std::vector<State>&, State, bool)':
wild_boar.cpp:76:23: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<State>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
76 | for (int i = 0; i < state_array.size(); i ++) {
| ~~^~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
212 KB |
Output is correct |
| 2 |
Correct |
1 ms |
212 KB |
Output is correct |
| 3 |
Correct |
1 ms |
212 KB |
Output is correct |
| 4 |
Correct |
1 ms |
212 KB |
Output is correct |
| 5 |
Correct |
1 ms |
212 KB |
Output is correct |
| 6 |
Correct |
1 ms |
212 KB |
Output is correct |
| 7 |
Correct |
1 ms |
212 KB |
Output is correct |
| 8 |
Correct |
1 ms |
212 KB |
Output is correct |
| 9 |
Incorrect |
1 ms |
212 KB |
Output isn't correct |
| 10 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
212 KB |
Output is correct |
| 2 |
Correct |
1 ms |
212 KB |
Output is correct |
| 3 |
Correct |
1 ms |
212 KB |
Output is correct |
| 4 |
Correct |
1 ms |
212 KB |
Output is correct |
| 5 |
Correct |
1 ms |
212 KB |
Output is correct |
| 6 |
Correct |
1 ms |
212 KB |
Output is correct |
| 7 |
Correct |
1 ms |
212 KB |
Output is correct |
| 8 |
Correct |
1 ms |
212 KB |
Output is correct |
| 9 |
Incorrect |
1 ms |
212 KB |
Output isn't correct |
| 10 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
212 KB |
Output is correct |
| 2 |
Correct |
1 ms |
212 KB |
Output is correct |
| 3 |
Correct |
1 ms |
212 KB |
Output is correct |
| 4 |
Correct |
1 ms |
212 KB |
Output is correct |
| 5 |
Correct |
1 ms |
212 KB |
Output is correct |
| 6 |
Correct |
1 ms |
212 KB |
Output is correct |
| 7 |
Correct |
1 ms |
212 KB |
Output is correct |
| 8 |
Correct |
1 ms |
212 KB |
Output is correct |
| 9 |
Incorrect |
1 ms |
212 KB |
Output isn't correct |
| 10 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
212 KB |
Output is correct |
| 2 |
Correct |
1 ms |
212 KB |
Output is correct |
| 3 |
Correct |
1 ms |
212 KB |
Output is correct |
| 4 |
Correct |
1 ms |
212 KB |
Output is correct |
| 5 |
Correct |
1 ms |
212 KB |
Output is correct |
| 6 |
Correct |
1 ms |
212 KB |
Output is correct |
| 7 |
Correct |
1 ms |
212 KB |
Output is correct |
| 8 |
Correct |
1 ms |
212 KB |
Output is correct |
| 9 |
Incorrect |
1 ms |
212 KB |
Output isn't correct |
| 10 |
Halted |
0 ms |
0 KB |
- |
